Power-transmitting means.



T. N. WILSON.

POWER TRANSMITTING MEANS.

APPLICATIGN man JULY 22.1915.

Patented Jan. 25, 1916.

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awmwtoz T. N. WILSON.

POWER TRANSMITTING MEANS.

APPLICATION FILED JULY 22.1915.

1,169,221. Patented Jan. 25, 1916.

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OF ONE-HALF .lO AARON POWER-TRANSMITTING MEANS.

To all whom it may concern:

Be it known that I, THOMAS N. WILSON, a citizen of the United States, residing at Spokane, in the county of Spokane and State of Washington, have invented cer' tain new and useful Improvements in Power-Transmitting Means; and I do doclare the following to be afull, clear, and exact description of the invention, suchas will enable others skilled in the art to which it appertains to make and use the same.

l/ily invention relates broadly to machine elements, and more particularly to'mecha nism for transmitting power and for con verting rotary into reciprocatory motion, the object ofthe invention being to provide means of this class whioh,although being simple and inexpensive, will be highly eiiicient and will be applicable to a wide range of uses.

With this general object in view, the invention resides in certain novel features of construction and in the unique combinations of parts hereinafter fully described and claimed and shown in the accompanying drawings wherein:

Figure l is an elevation of a wood sawing machine showing the application of the invention thereto for the purpose of reciprocating the saw thereof, this figure disclosing a side View of the invention; Fig. 2 is a view similar to Fig. l but showing an edge view of the invention; Fig. 3 is a longitudinal section as viewed on the plane indicated by the line 3-8 of Fig. 2; Fig. 4 is an additional longitudinal section taken on the plane designated by the line H of Fig. 3; Figs. 5 and6 are transverse sections taken on the planes designated by the lines 5-5 and 6-6 of Fig.1; and Fig. 7 is a detail of a pair of rigid arms yet to be'described, and the collar carrying the same.

In describing the invention, 1 shall refer to the accompanying drawings by similar reference characters placed on corresponding parts throughout the several views, the numeral 1 having reference to a bed plate or engine bed from which a rigid bar 2projects forwardly, said bar having on its front end a prong 3 to be driven into a tree or other body 4: being sawed. Projecting rearwardly from the bed plate 1 is an appropriate handle 5 by means of which the entire machine may be steadied when disposed as shown in Figs. 1 and 2 or in other ways,

Specification of LettersPate-nt. i

"Patented Jan. as, rare;

Application filed July 22, 1915 Serial No. 41,330.

the machine being applicable not only for cutting down trees but for sawing logs lying in horizontal positions.

Secured in any preferred manner to the bed plate 1 is a light gasolene engine 6 whose shaft 7 is positioned transversely of being still further augmented, by the curved brace arm 13 which through a slot or other 14 in the bar 2 and is a third body at.

Lying parallel to the bar 2 and adapted to be reciprocated, is an appropriate saw 16 whose rectilinear edge is engaged by a roller 17 on a. spring pressed arm 18 carried by the bar 2, this arm having a tendencyto force the saw toward the body being out. I

Although a certain coaction yet to become evident exists between certainof the parts, so far described and the invention proper, the construction of the features so far passes adjustably appropriate guide provided with yet prong 15 to be driven intothe briefly set forthconstitutes no part of the invention, the latter residing in the provision of means for transmitting power. from the engine shaft 7 to the saw 16. In accomplishing this result, a pinion 19 is keyed to the end of the shaft 7 remote from the fly wheel 9, the teeth of said pinion being meshed with gear teeth 20 on the inner side of an endless substantially elliptical rack 2l,-said rack being shown in the pres-- ent embodiment of the invention as comprising a pair of parallel side bars 22 connected by rounded ends 28.

For retainingthe pinion 19 in mesh with the teeth'20 of the rack 21, a pair of circular plates 21 is mounted on the shaft 7, said plates being disposed one in contact with each end of the aforesaid pinion. Ihe plates at are provided in their outer sides with annular grooves 25, each of which partially receives therein a ball 26, the remaining portions of these balls being received in endless grooves 27 :t'ormed in the inner sides of endless tracks 28 which are secured by screws or the like 29 to the opposite edges of the side bars 21 and rounded ends 23. Thus it will be seen that as the pinion 19 is rotated by the engine, the rack 21 will be shifted in one direction or the other until the pinion encounters the teeth on one curved end of said rack, whereupon the entire rack will be shifted laterally and the pinion will engage the teeth on the side bar 22 opposite that with which said pinion has previously beenin mesh, thereby causing the entire rack to be shifted in a reverse direction, This operation takes place as long as the engine is operated, with the result that the saw 16 which is connected to the 'rack, is reciprocated. During this opera- I tion, the balls 26 travel within the grooves and 27 and retain the pinion 19 in mesh with the teeth 20 at all times.

For effectively supporting the rack 21 when the machine is used as shown in Figs. 1 and 2 for cutting down trees, a pair of axially shiftable rollers is provided, said rollers being grooved peripherally and receiving in their grooves the thickened side bars 28 of the track 28, such side bars therefore constituting additional tracks. The rollers 30 are mounted rotatably and slidably upon a pair of rigid arms 31 which project from diametrically opposite points on a collar 32, the latter encircling the adj acent bearing 8 of the engine and being secured thereto by a set screw or the like 33. This arrangement of parts effectively accomplishes the desired end, yet the entire rack is allowed to have the necessary movement both longitudinally and transversely.

Thesaw 16 may be secured in a number of ways to the rack 21 but one of the curved ends 23 of the latter is preferably provided with an outstanding flange 3 1 through which bolts or the like 35 are passed to removably connect the saw and the rack. One of the side bars 22 of the rack 21 is shown in the present embodiment of the invention as provided on its outerside with a longitudinally extending rib 36 alined with the rectilinear edge of the saw 16 which is engaged by the roller 17, whereby when the rack and saw are shifted to such an extent as to shift the latter beyond the roller 17, said roller will then bear upon the rib 36 and will continue to exert pressure on the saw toward the work. 7

From the foregoing description, taken in 7 Copies of this patent may be obtained for five cents each, by addressing the 7 Washington, D. G.

connection with the accompanying drawings, it will be evident that although comparatively simple construction has been provided, the invention will be efficientand durable and will possess a number of advantages.

I claim:-

1. In combination, an endless rack having teeth to be engaged by a driven pinion, a driven shaft adapted to carry the aforesaid pinion, a circular member carried by the shaft and having in one side an annular groove disposed concentric to the shaft, a ball disposed partially in said groove, and an endless track carried by the rack and having an endless groovereceiving the remainder of the ball therein.

2. In combination, an endless rack, a driven shaft, a pinion secured to said shaft and meshed with the rack, a circular plate adjacent one end of said pinion, mounted on the shaft concentric therewith, and. having in its outer side an annular groove, a ball partially received in said groove, and an endless track carried by the rack and receiving the remainder of said ball.

3. In combination, an endless rack, a driven shaft, a pinion secured to said shaft and meshed with the rack, a circular plate adjacent each end of the pinion, mounted on the shaft concentric therewith and each having an annular groove in its outer face, a pair of balls partially received in said grooves, and a pair of endless tracks carried by the rack and each having an endless groove receiving the remaining portions of said balls.

4. In combination, an endless rack, a driven shaft, a pinion secured. to said shaft and meshed with the rack, a circular plate adjacent one end of said pinion, mounted on the shaft concentric therewith, and having in itsouter side an annular groove, a ball partially received 1n said groove, an

endless track carried by the rack and having in its inner side an endless groove receiving the remainder of the ball, and a pair of axially shiftable rollers upon which the outer sides 'of said tracks bear.

' In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

V THOMAS N. WILSON. Witnesses: V s

' H. G. WILSON, S. A.,WILsoN.

Commissioner of Patents, 

